If one is lighting Chanukkah candles inside (for whatever reason) relying on the publicization to himself and his family, then what should he do on Friday night if he is eating out? Must he make the candles long enough to see for half an hour when he comes back, or is half an hour after nightfall enough?

(He shouldn't light at the host's house, since lighting where you won't be sleeping doesn't fulfill the obligation.)

In terms of shabbat candles, I was always told to either light at the host or light long enough candles to see when I return. Is this halacha parallel?

1 Answer
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Give your dinner host a shavah perutah before shabbos to be a shuttaf in his candles. Since you are now a partial owner, you can be yotzei with their lighting of the jointly owned candles. There are similar solutions mentioned by lighting shabbos candles when you won't be/aren't home, though sources currently are eluding me.

Can you address what the point of lighting not where you sleep is?
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Double AA♦Feb 17 at 2:01

Nice discussion of lighting in shul that may be relevant. The point there was that a person is lighting where his home is in order to engage in pirsumei nisa with his family. No one lives in a shul to fulfill the precept of "ner ish ubeiso," so lighting there literally accomplishes nothing for nobody. See question 9 here - If the choice is between where you sleep and where you eat, you go with where you eat. Here, that is our only option.
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Isaac KotlickyFeb 17 at 3:03